Question: At what time did Ulaanbaatar have a population of 1.372e+06?
Paraphrase: When did Ulaanbaatar have a population of 1.372e+06?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q23430 p:P1082 ?s . ?s ps:P1082 ?x filter(contains(?x , '1.372e+06')) . ?s pq:P585 ?value}